Old as Dust

Benefit(s): When you are reduced to 0 hit points, you are not destroyed— you cannot be killed unless your body is completely destroyed with fire or doused in holy water, or you take damage from a cure spell or channeled positive energy after you’ve been reduced to 0 hit points. Anytime you are reduced to 0 hit points, you remain unconscious until you are healed or until the following midnight, at which time you regain 1 hit point per Hit Die and awaken.